Tuesday
September 30, 2014

Homework Help: trig

Posted by killie on Thursday, April 30, 2009 at 7:01pm.

I am very confused about the concepts of..
sin = sin(180 - )
sin (180 + )= -sin
tan (180 - ) = -tan

and how the final answer was found in this problem...

Find cos 510:

cos510=cos(540-30)
=-cos30
=-s.r3/2

i dont understand how we went from -cos 30 to -s.r3/2 ?

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